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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27392 results found.

  1. GRB 060607: REM NIR afterglow
  2. GRB 060607: Swift detection of a burst with bright optical counterpart
  3. GRB 060522: PROMPT Optical Limits
  4. GRB 060605 BAT refined analysis
  5. GRB 060605: Xinglong TNT optical observations
  6. GRB060602B : REM infrared observations
  7. GRB060605: Swift/UVOT detections
  8. GRB 060605: Swift-XRT Team refined analysis
  9. GRB 060605: RTT150 optical observations
  10. GRB 060605: Swift detection of a burst with optical counterpart
  11. GRB060604: Swift/UVOT detections
  12. GRB 060604: Swift-XRT Team refined analysis
  13. GRB 060604: BAT refined analysis
  14. GRB 060604A: ROTSE-III Optical Limits
  15. GRB 060604: Swift detection of a burst with possible optical counterpart
  16. GRB 060602A: Swift-BAT Refined Analysis: Correction
  17. GRB 060602B: Swift-XRT Refined Analysis
  18. GRB 060602B: Swift-BAT Refined Analysis
  19. GRB 060602B: Swift/UVOT observations
  20. GRB 060602A: Swift-BAT Refined Analysis
  21. GRB 060211A : WIDGET simultaneous optical observations
  22. GRB060602A: optical observations(/transient?)
  23. GRB 060602B: Swift detection of a burst
  24. GRB060602B: BOOTES-IR candidate afterglow
  25. GRB060602 - SDSS Pre-Burst Observations
  26. GRB 060502A: Optical afterglow observations
  27. GRB 060526: Break in X-ray light curve
  28. GRB060526, optical observations
  29. GRB 051227 : WIDGET simultaneous optical observations
  30. GRB 051028 : WIDGET pre-trigger limit
  31. GRB060526: Optical counterpart from MIRO
  32. GRB 060526: RTT150 optical observations
  33. GRB060526: optical observations
  34. GRB 060526: REM observations
  35. GRB 060526: RTT150 optical observations, afterglow flattening
  36. GRB 060526: MDM-2.4m Observations
  37. GRB 060526: Refined analysis of the Swift-BAT burst
  38. GRB 060526: RTT150 optical observations
  39. GRB060526, optical observations
  40. GRB 060526: Swift/XRT Team refined analysis
  41. GRB 060526: ROTSE-III Observations of Optical Counterpart
  42. GRB 060526: Watcher Observations
  43. GRB060526 - SDSS Pre-burst Observations
  44. GRB 060526: Swift detection of a burst with x-ray and optical afterglow
  45. GRB 060413 : WIDGET simultaneous optical observations
  46. XMM-Newton observation of GRB060510b
  47. GRB060512: Late-Time P200 Observations
  48. GRB 060522: Swift-BAT Refined Analysis
  49. GRB 060522: REM NIR observations
  50. GRB 060522: TNG optical observations
  51. GRB 060515: NIR observation
  52. GRB 060210: Jet Break in the XRT light curve
  53. GRB 060516: Refined analysis of the Swift-BAT burst
  54. GRB060515: P200 NIR Observations
  55. GRB 060505 BAT refined analysis
  56. GRB 060515 BAT refined analysis
  57. GRB 060512: TAROT optical observation
  58. GRB 060515: Swift/XRT Team refined analysis
  59. GRB 060515: Swift/UVOT Upper Limits
  60. GRB 060515: Swift/XRT position
  61. GRB 060515: Super-LOTIS Observations
  62. GRB 060515: TAROT optical observation
  63. GRB 060512: Subaru NIR observation
  64. GRB060512: Swift XRT Team refined analysis
  65. GRB 060512: 1.54m Kuiper Observations
  66. GRB 060512: Detection of NIR afterglow
  67. GRB 060512: P60 Observations
  68. GRB 060512: Swift-BAT Refined Analysis
  69. GRB 060512: REM NIR observations
  70. GRB060512 - SDSS Pre-Burst Observations
  71. GRB 060512: Swift detection of a burst with an optical afterglow
  72. GRB 060505: X-ray afterglow - Correction -
  73. GRB 060505: X-ray afterglow
  74. Konus-Wind observation of GRB 060510A
  75. GRB060418: optical observations
  76. GRB 060428a, SMARTS optical/IR afterglow detection
  77. GRB060510B: Swift XRT refined analysis
  78. GRB 060510A: Refined analysis of the Swift-BAT burst
  79. GRB 060510B: Swift-BAT Refined Analysis
  80. GRB060510A: XRT refined analysis
  81. GRB060510 - SDSS Pre-Burst Observations
  82. GRB 060510B: Swift detection of a burst
  83. GRB 060510: Swift detection of a burst with optical transient
  84. GRB060507: optical afterglow detection
  85. GRB060502B: improvement in the XRT afterglow position
  86. GRB 060507: Final Refined analysis of the Swift-BAT burst
  87. GRB 060507: Swift-BAT Refined Analysis
  88. GRB 060505: PROMPT Observations
  89. GRB 060507: Swift XRT Team Refined Analysis
  90. GRB 060507: Swift detection of a burst
  91. GRB 060429: Suzaku WAM observation
  92. GRB060505: Swift/UVOT Observations
  93. GRB060425: new MASTER survey method
  94. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  95. GRB 060505: Swift XRT afterglow canditate position
  96. GRB 060502b: Second epoch Gemini observations
  97. GRB 060505: Swift-BAT detection of a weak burst
  98. GRB 060428B: spectroscopy
  99. GRB 060502B: optical observations
  100. GRB 060502B: AROMA refined photometric calibration

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